/Engine/Source/Runtime/Engine/Public/AnimationUtils.h
Array to keep track of SkeletalMeshes we have built metadata for, and log out the results just once.
static void BuildSkeletonMetaData ( [USkeleton](API\Runtime\Engine\Animation\USkeleton) * Skeleton, [TArray](API\Runtime\Core\Containers\TArray)< [FBoneData](API\Runtime\Engine\Animation\FBoneData) > & OutBoneData )